Depends on how you look at it. Batman and Robin changed studios additude towards the genre, then Batman Begins became a big influence for the genre, at least two films have it as reference, one of which began the road to Avengers. So I think it's a fair statement.

Yeah, except, that Blade, X-Men, Daredevil, and Spider-Man all came out prior to BB and after B&R; BB was no more of a road-paver to Avengers than the super hero movies that came before it.